Information extraction apparatus, information extraction method, and information extraction program

Abstract

An information extraction apparatus includes, a controller extracting, as variable elements, parts different between a plurality of structured documents and extract, as peripheral information pieces, elements within a predetermined range from the respective variable elements, and a storage unit storing the variable elements and the peripheral information pieces with respect to at least an extraction object which is at least one of the variable elements. The controller re-extracts variable elements and peripheral information pieces from the plurality of structured documents, calculates similarities of the variable elements and the peripheral information pieces between before and after the re-extraction, on the basis of (i) the re-extracted variable elements and the re-extracted peripheral information pieces and (ii) the variable elements and the peripheral information pieces stored in the storage unit, and identifies, out of the re-extracted variable elements, a variable element corresponding to the extraction object, on the basis of the calculated similarities.